The crystallization behavior of an amorphous polymer, bisphenol A polycarbonate (BAPC), was evaluated. BAPC was crystallized by exposure to diphenylpropane, a component of BAPC, by vapor transportation methods. Furthermore, the surface of BAPC was also crystallized by this method. Crystallized BA-PC was employed as a novel simple storage medium, and bit patterns were recorded on its surface by laser irradiation. (c) 2005 Wiley Periodicals, Inc.